SonicFuel® In-ear Headphones

MSRP* US$94.95
Two-Year Limited End-User Warranty

*Manufacturer's Suggested Retail Price. Actual selling price may vary; please check with an authorized Audio-Technica dealer.

  • in ear headphone

  • Overview
  • Features
  • Specifications
  • Reviews
  • Q & A

  • Overview

    Music is your energy for life – the fuel for your heart and soul. SonicFuel® headphones are specifically designed for active, daily use, to power you forward by delivering extraordinary comfort, style and an immersive listening experience that never sounds artificial, processed or filtered. Just pure sonic goodness for the high-octane tempo of your life.

    The ATH-CKX9 SonicFuel® in-ear headphones feature stay-in-place fit, providing unique comfort in addition to optimal sound. The C-tip configuration nestles within the ear where it locks in place for extra stability. Customize your comfort with a multitude of C-tip & silicone eartip sizes or use the included Comply™ foam eartips for true sonic immersion.

    Large 13.5 mm performance-enhanced drivers fuel your day with a premium listening experience, deeper bass response and sparkling high frequencies.

    A newly designed flat cable eliminates annoying tangles and lasts longer. The included hard carrying case keeps your headphones protected and organized, so they are easy to find and unravel every time.
  • Features

    • Large 13.5 mm performance enhanced drivers offer a premium listening experience

    • C-tip design fits the shape of your ear for reliable stay-in-place comfort

    • Included luxury zippered hard carrying case keeps headphones protected and easy to find every time

    • Also includes Comply™ foam tips, silicone eartips (XS/S/M/L), C-tips (S/M/L), and tangle-free flat cable

    • Available in black (BK) and silver (SV)

  • Specifications

    Driver Diameter13.5 mm
    Frequency Response5 - 25,000 Hz
    Maximum Input Power20 mW
    Sensitivity104 dB/mW
    Impedance32 ohms
    Weight10 g (without cord)
    Cable1.2 m, Y-type
    Connector3.5 mm gold-plated stereo mini-plug, L-type
    Accessories IncludedHard carrying case, Comply™ foam eartip (M), silicone eartips (XS/S/M/L), C-tips (S/M/L)

  • Reviews


    by PowerReviews
    Audio-TechnicaATH-CKX9 SonicFuel™ In-ear Headphones

    (based on 1 review)

    Ratings Distribution

    • 5 Stars



    • 4 Stars



    • 3 Stars



    • 2 Stars



    • 1 Stars



    Reviewed by 1 customer

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    Clear Sound


    from Israel


    • Great Sound
    • Lightweight
    • Stylish


    • Uncomfortable

    Best Uses

      Comments about Audio-Technica ATH-CKX9 SonicFuel™ In-ear Headphones:

      Trable & Mids: Clear and detailed , but not rolling off. Fun and enjoyable instrument and vocal sounds - Audio Technica great known signature.
      Bass: mid bass is there, sub bass too, but it's restrained and accompany the highs without overcome it. Not recommended for hard bass lovers. Overall balanced signature, doesn't lack something on the spectrum
      Comfort: Large in ear (most sits out of thr ear), Very stable on workout
      Build quality: Expected better on this price range. after two days of normal use. the plastic connected area between the nozzle and driver starts to rotate a little. Hope it will last, only one week old :(
      I assume that my next in-ear will be more bassy for sports (maybe cks99)

      • What best describes the environment the product was used in?:
      • Working Out
      • How long have you used this product?:
      • Less than a month
      • Reliability:
      • Audio Quality:
      • Durability:
      • Ease of Use:

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    • Q & A

      Do you have questions about this product?

      Get answers from real customers and in-house experts with AnswerBox.

      2 Questions | 2 Answers
      Displaying questions 1-2
      • Q:

        Where can i buy replacement c tips? I can find earbud tips to buy but not the c tips that surround the body of the earbuds.i tore mine and i need replacements.
        Asked on 11/14/2015 by Rin

        1 answer

        • Staff Reviewer


          Please contact our Parts Department at (330) 686-2600 ext 5002 or at for assistance with this.

          Answered on 11/16/2015 by ATUS_Specialist3
      • Q:

        Does it have microphone?
        Asked on 9/21/2015 by Karthik

        1 answer

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